Process of preparing dinitrodiphestylamin



. inq in water.

STA$ PATENT OFFICE.

JOHN MARSHALL, OF SWARTHMORE. PENNSYLVANIA, ASSIGNOR TO E. I. no FONT DE NEMOURS &, COMPANY, OF WILMINGTON, DELAWARE, A CORPORATION OF DELA- WARE.

No Drawing.

pro 'mrtion ot' diniti'oehlorbenzol, and then to heat the mixture slightly until the reaction begins. thus forming a mixture of dinitrodi ihenylamin and anilin hydroehlorid. This reaction, however, caused a considerable evolution of heat so that it was necessary to check the reaction by cooling as by drown- In this way a hard mass was oln-aiued which it was necessary to grind and extract with'water in order to dissolve out the anilin hydrochlorid' The object of my invention is to provide animproved process of obtaining dinitrodipbenylamin by means of which the temperature is readily controlled and the dinitrocliohenylamin is obtained in the "form of finely divided crystallii'ie particles which makes the anilin hydrochlorid readily removable.

While my invention is capable of being carried out in many different ways, for the purpose of illust'ation I shall describe only one Way of carrying". out the same hereinafter,

I found that if an emulsion of anilin and dinitrochlorbenzol is made by rapid agitation with a solvent of anilin. hydrochlorid, which mayor may not dissolve one of the raw materials used. but which should dissolve but little of the dinitrodiphenylamin formed, and heating the emulsion thus obtained to a temperature at tion begins, the heat of the reaction is controlled by the resulting evaporation of the solvent and, furthermore, the dii'iitiodiphenylamin is precipitated in crystalline particles which can be readily washed to remove the major portion ol' the anilin hydrochloricl.

-For example l may add one part by weight of molten dinitrochlorbenzol to one Specification of Letters Patent.

which the reac- PROCESS OLE PREPARING DI NI'IRODIPHENYLAMIN.

atented July 8 l9! 9.

Application filed October 18,1918. Serial No. 258.698.

part by weight of a uilin previously warmed to a temperature of 35 to 4-0 (L, thus obtaining a solution. The tluid thus obtained is then added with vigorous agitation to six parts by weight of \vatenheated to about C. The constituents are now agitated until a finely divided emulsion is obtained and live steam is thereupon introduced to bring up the tennicrature to 80 (3., at

which point the reaction begins. The agitation is continued until the reaction is completed \\'lll(.ll requ1re.-; from one half to one hour, and the agitation is continued tor a further period of one half to one hour to Cil example, in an oven at 80 0., without the necessity of any 'l'urther grinding or washing.

\Vhile l have described my invention in detail, I wish itto be understood that many changes may be made therein without depa rting from the spirit of the same. F or example--the above proportions and temperatures may be varied to a considerable degree.

'l. "he process which comprises forming dinitrodiphenylamin by emulsifyinganilin and dinitroehlorbenzol in a liquid and raising the temperature to the point at which the reaction begins.

2. The process. which comprises forming dinitrodiphenylamin by emulsifying anilin and dinitrochlorbenzol solvent of the anilin hydroehlorid produced, and raising the temperature which the reaction begins.

3. The process which comprises forming dinitrodiphenylamin by emulsifying anilin "and dinitrochlorbenzol in a liquid which is a solvent of the anilin l'iyclrochlorid but not a solvent of the dinitrodiphenylamin produced, and raising the temperature to the point at which the reaction begins.

in aliquid which is a to the point at dinitrodiphenylmnin by emulsifying anilin and cllnitrochlorbenzol in water and raising the temperature to the point at which the I reaction begins.

The process which comprises forming dinitrochphenylumin by emulsifying anllin ,uutl (linitmchlorbenzol in a liquid, raising and Washing the temperature to the point at which the reaction begins, then separating the tl'initrq (liphenylumin from the liquid and. washing the dih itrodiphenylamin thus obtained.

"6 The process which comprises forming dinitrodiphenylamin by emulsifying enilin and clinitrochlorbenzol in a, liquid which is a solvent- 01 the anilin hydrochlorid ducecl, raising the temperature to the point at'which the reaction begins, then. separating the clinitrotliphenylamin from the liquid and washing the dinitrodiphenylamin thus obtained.

7. The process which" comprises forming v dinitrodiphenylumin by emulsifying anilin. and chmtrochlorbenzol in a l qu d which is a solvent of the enilin hydrochlorid but not a" solvent of the clinitrodiphenylumin pr duced, raising the tei-np-erztture to the point atlwhich the reaction begins; then separating the clinitrodiphenylamin from the liquid the dinitrodiphenylumin thus obtained. I I y 8. The process itiliich comprises forming dinitrodiphenylamin by emulsifying. anilin and clinitrochlorbenzol in water, raising the temperature to the point at 'WhlCll the re: action begins, then separztting' the volinitro- -(li1 3henyla1ninfrom the-Water and Washing the dinitrodiphenylamin'thus obtained. .1

9.,The' process which comprises forming dinitrod phenylamin by. emulsifying aniliii' and dinitroohlorbenzol ine liquid. and reising the temperature to the point atiwhich the reaction begins, the enilin, clinitrochlorbenzol and the liquikzl being War-m before mixing the same togethen y 10. The 'process which comprises forming dinitrodiphenylamin by emulsifying a'n ilin 4 duced, and raising and dinitrochlorbenzol inla, liquid which is a solvent of the tnilin hydrochloricl produceglfiinol raising the temperature to the point at which the reaction begins, the enilin, dinitrochlorbenzol and" the liquid being werni before mixingthe semetogether.

11. The process-Which comprises forming fdinitrodiphenylamin by emulsifying anilin' and clinitroch'lorben zol in a liquid which is a solvent of the anilin hydrochloricl but not a solvent of thedinitrodiphenylamin prothe temperature to the point :the liquid being warm before 1.

the temperature to the point at which the reaction begins,- the anilin, .(linitrochlorbenzol and the liquicl'being Y Warm before mixing the same together.

The process which comprises formingdinitrocliphenylzimin by emulsifying euilin and dimtrochlorbenzol in water and rule-.1115;

tiinitroehloi reaction begins, the anilin,

Warm beiore benzol and the WiLiJGl' being mixing the same together. r

13. The process which comprises formi' dinitrocliphenyleniin by emulsifying unilin and clinitrochlorliienzol in a liquid, raising tie temperature to the'point at which the realction bt-zgins t hen sepurztting the clinitrmli-- flinitrocliphenylamih thus obtained, the uni lin, dinitrochlorbenzoland the liquid bei'n}; warm before mixing the seine together.

7 1-1. The process which comprises forming dinitrocliphenylamin by emulsifying; aniliu and dinitrocliloi'benzol in a'liquid which is phenylumin from the liquid anol Washing the e solvent of the a-nilin hydrochlorid pro-- duced',- raising the temperature to the point t \lVlllCll the reaction begins, thenlsepumtmg the diniti odiphenylamin from the liquid and. Washing the vclinitrodliphenylu1min thus obtained, the 211111111,dinitrochlorbenzql and the liquid being Wei-m before mixing the same t-og ither.

15. The process which comprises forming dinitrodiphenylztmin by emulsifying anilin and;dinitrochlorbenzol 'in' a liquid which is it solvent of the anilin hydrochloricl but not a solvent of the dinitrodiphenylamin pro duced, raising the tempereture to. the point ut which the 'r'euctionibegins ti en separating the dinitrodiphenyleiniii from the liquid and Washing the dinitrodiph nvluuiln thus obtzuned, the 'anilln.

g the same together" 16." Tl1e proeess WJlCl] comprises forming clini-troclip'h'enylumin by emulsifying enilin end.- dinitrochlorbenzol in Water, raising the temperature to the point at which the resin dinitro ehilo benyol anti tion begins then separating the dinitrooii its 

